現今的專案常常遇到內外部的因素使得計畫必須有所變更，如因應顧客變更要求、或是內部無法達成目標所做之變更。當專案改變時，會引發一連串的連鎖效應，最後可能造成成本、進度和品質上的直接衝擊，其影響的範圍從專案團隊的運作，遍及至組織整體績效與顧客滿意度。因此當專案發生計畫內容變更時，團隊的績效往往都會降低，故需要一個良好的管理機制來處理和維持整體績效。
經由文獻探討發現，專案團隊中知識分享可以維持競爭優勢，幫助提升成員解決問題的能力和任務的協調性。反言之，若知識未能有效率地分享給組織成員，則會導致員工生產力不平衡、產品失敗或專案延遲等問題。故知識分享不只影響專案運作時的溝通與協調，也包含了成員之間的信任，故擁有良好的知識分享可以使團隊順利運作並且提升績效。因此本研究的目的為探討當專案計畫變更時，知識分享如何影響團隊整體的績效，了解兩者之間的因果關係，並提出對實務上有效益的政策，做為管理者在面臨專案計畫變更時管理之依據。
本研究透過系統動力學(System dynamics)作為研究方法，針對專案團隊做深度訪談來進行資料收集，建立系統動力模型描繪專案過程與知識分享之因果關係，利用模擬的結果來觀察系統行為變化，發現在專案改變時，知識分享機制的運用，可幫助提升成員的生產力和確認問題率以及降低專案錯誤率，然後藉由政策之分析模擬，提出知識分享上實務建議，具體行為包含正式的師徒制、促進實務社群之互動、良好的文件化管理和專案小組，制定出相關的知識分享策略，以便當專案面臨計畫變更時，仍舊可以如期交付專案執行成果並且維持專案團隊的整體績效。

Owing to the internal and external factors, unpredictable changes may usually happen on the projects at present times. When a project team responds to customer requests or they cannot achieve the goals set this can lead to a series of knock-on effects, which may have direct impacts on cost, production schedule and quality. Consequently, we need a good management mechanism to maintain the performance of project when such changes occur.
The literature review indicates that knowledge sharing can help maintain competitive advantage in a project team, and help to promote the abilities of coordination and problem solving. On the other hand, it will cause reductions in productivity and increases in product failure or project delay if the knowledge cannot be shared efficiently among all organization members. Therefore, knowledge sharing not only influences communication for operating projects and coordination, but also the trust among organizational members. Therefore, this research investigates how knowledge sharing influences the teams’ performance when the context and scope of the projects changes. This study also looks into both the cause and effect relationships, and suggests practical and beneficial policies as basis of project modification for managers.
This research utilizes System Dynamics (SD) approach, and performs in-depth interviews with project teams to collect research data. It then builds a research model to describe the causes, effects and relationships in the project process of system motivation and the knowledge sharing. The conclusion demonstrates the results of system simulation to observe the systematic behavior changing. This study concludes that an appropriate knowledge sharing mechanism can raise productivity and problem solving ability, and reduce project’s error rate when the changes occur. Moreover, the study suggests practical knowledge sharing policies by analyzing the simulation of the programs. These specific policies include apprenticeship, community of practice, efficiency document management and project team to promote the interaction of project teams or community. The most important purpose of this article is to address several knowledge sharing strategies for project teams to maintain the performance and present the outcomes on schedule, even critical changes happen on both the scope and context of projects.

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